Lanthanum Oxide Tungsten Wire Rod for High-Strength Fine Diameters
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Solution Overview
Problem
Existing high-strength tungsten wires have performance defects such as poor toughness and complex production processes, making them difficult to process into smaller diameters and higher tensile strengths needed for applications like cutting hard materials and medical/industrial wire ropes.
Innovation Solution
An alloy wire rod made of tungsten with added lanthanum oxide and optional metallic elements, processed through doped powder making, pressing, sintering, and cogging to achieve diameters of ≤100 μm and tensile strengths of >3,800 MPa.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional tungsten wires are used to achieve high tensile strength, then tensile strength can reach above 4,000 MPa, but toughness becomes poor and processing becomes extremely difficult
Solution Approach 1:
The patent uses tungsten powder as the base material and adds rare earth oxide (0.1-3.0 wt%) as a composite additive. This composite structure improves both tensile strength and toughness simultaneously, resolving the contradiction between strength and processability. The rare earth oxide forms a composite material system that enhances mechanical properties while maintaining manufacturability.
Solution Approach 2:
The patent changes the chemical composition parameters by introducing rare earth oxide at controlled concentrations (0.1-3.0 wt%). This parameter modification transforms the material properties, achieving tensile strength above 4,000 MPa while improving toughness and reducing processing difficulty. The controlled compositional change enables simultaneous optimization of multiple properties.
2Length of moving object
If high-carbon steel wires are processed to achieve smaller diameters, then diameter can be reduced below 50 μm, but tensile strength drops below 4,500 MPa
Solution Approach 1:
The patent creates a composite wire rod system combining tungsten powder with rare earth oxide additives. This composite structure maintains high tensile strength (above 4,000 MPa) even when diameter is reduced to 100 μm or below, overcoming the strength loss that occurs in high-carbon steel wires at small diameters.
Solution Approach 2:
The rare earth oxide is distributed throughout the tungsten matrix, creating local reinforcement zones. This local quality enhancement ensures that even at reduced diameters, the wire maintains sufficient tensile strength through localized strengthening effects within the composite structure.
3Device complexity
If conventional tungsten wire production process is used, then production can be simplified, but tensile strength remains below 4,000 MPa and toughness is poor
Solution Approach 1:
The rare earth oxide is added during the powder mixing stage, before sintering and drawing processes. This preliminary action ensures uniform distribution of the strengthening phase throughout the material, achieving tensile strength above 4,000 MPa while maintaining a relatively simple production process without requiring additional complex processing steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The alloy wire rod achieves high tensile strength, flexibility, and ease of processing, enabling applications in cutting hard materials and medical/industrial wire ropes with improved durability and flexibility.
Implementation Method 1
the oxide of lanthanum is mainly distributed at a grain boundary of a tungsten main phase... The oxide of lanthanum can effectively inhibit grain boundary sliding and dislocation movement
Implementation Method 2
the cogging includes conducting cogging on a sintered billet by a multi-roll rolling way so that the ratio of the longitudinal length of particles of the oxide of lanthanum in a rolled tungsten rod along the wire rod to the particle size of the cross section of the particles is greater than 5
Implementation Method 3
the solid-liquid doping includes conducting staged drying on a mixed tungsten-doped solution, the staged drying at least includes 2 temperature stages, and the 2 temperature stages are divided with 100° C. as a division line
Data Source
AI summary
The present disclosure relates an alloy wire rod and a preparation method and application thereof. The alloy wire rod is made of a tungsten alloy, and the tungsten alloy contains tungsten and an oxide of lanthanum. The alloy wire rod has a wire diameter of equal to or less than 100 μm; and the alloy wire rod has a tensile strength of greater than 3,800 MPa. The wire diameter of the alloy wire rod is equal to or less than 60 μm; the diameter of a push-pull core wire of the alloy wire rod is less than 350 μm; the elastic ultimate strength of the alloy wire rod is greater than 2,500 MPa; and the tensile strength of the alloy wire is greater than 4,200 MPa. In the present disclosure, the alloy wire rod having ultra-high strength and good toughness is obtained by doping an oxide of lanthanum.